Excel 2007: XLS treated the same as XLSM?

[reneuend]

My client is moving from Excel 2003 to Excel 2007 very slowly (1-2 years). I'm tasked with making sure their models work in both Excel 2003 and 2007. They would like to keep the file extension as "XLS".

My question is, does Excel 2007 treat "XLS" files differently from "XLSM" files? There is a lot of VBA, charts, and formulas in these models.

Thank you for any replies!

 

[xld]

Not if you have the compatibility packs installed http://office.microsoft.com/en-us/s...powerpoint-2007-file-formats-HA010168676.aspx

 

[reneuend]

Thanks, XLD. I'll have to investigate. Microsoft products are automatically updated on the company laptops that are issued to everyone.